test: Consolidate tests

[isaacvando]

Ticket(s) Closed

• Deletes many unnecessary tests (e.g. just testing the DB or Django with nothing to do with the ORM).
• Consolidates many other tests into more focused files.
• Updates most tests to assert against full generated SQL and run the query. This validates that the generated SQL is valid and uncovered some tests that were generating invalid SQL that could be removed.

Goes from 545 tests to 274 tests while keeping code coverage at 90%.

What

Why

How

Tests

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.25%. Comparing base (a57ce99) to head (6859f06).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #126      +/-   ##
==========================================
- Coverage   90.25%   88.25%   -2.00%     
==========================================
  Files          11        9       -2     
  Lines        1272     1209      -63     
  Branches      268      254      -14     
==========================================
- Hits         1148     1067      -81     
- Misses         76       83       +7     
- Partials       48       59      +11     

Flag	Coverage Δ
dj4.2	88.25% <ø> (-2.00%)	⬇️
dj5.2	88.25% <ø> (-2.00%)	⬇️
dj6.0	88.25% <ø> (-2.00%)	⬇️
django-paradedb	88.25% <ø> (-2.00%)	⬇️
pg15	88.25% <ø> (-2.00%)	⬇️
pg16	88.25% <ø> (-2.00%)	⬇️
pg17	88.25% <ø> (-2.00%)	⬇️
pg18	88.25% <ø> (-2.00%)	⬇️
py3.10	88.25% <ø> (-2.00%)	⬇️
py3.11	88.25% <ø> (-2.00%)	⬇️
py3.12	88.25% <ø> (-2.00%)	⬇️
py3.13	88.25% <ø> (-2.00%)	⬇️
py3.14	88.25% <ø> (-2.00%)	⬇️

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Files with missing lines	Coverage Δ
paradedb/functions.py	91.66% <ø> (-6.78%)	⬇️
paradedb/queryset.py	77.33% <ø> (ø)

... and 3 files with indirect coverage changes

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